Telescope-sight attachment.



33-2415 OR 191981665 5R A. B. ROLFE-MARTIN.

TELESCOPE SIGHT ATTACHMENT.

APPLlcmou 111m rfa. 23.1916.

1,198,665. Patemedsepn 19,1916.

UNITED sTATEs PATENT oEEroE ARTHUR BERNARD ROLFE-MARTIN, OF KENTISHTOWN, LONDON, ENGLAND, ASSIGNOR TO PERISCOPIC PRISM COMPANY, LIMITED, OFKENTISH TOWN, ENGLAND.

TELESCOPE-SIGHI ATTACHMENT.

Specification of Letters Patent.

Patented Sept. 19, 1916.

Application filed February 23, 1916. Serial N o. 79,906.

To all whom t may concern Be it known that I, ARTHUR BERNARDRoLrE-MARTIN, a subject of the King of Great Britain, residing at 23Prince of Tales Crescent, Kentish Town, in the county of London,England, have invented certain new and useful Improvements inTelescope-Sight Attachments, of which the following is a specification.

This invention relates to methods of attachment of telescope sights tofirearms and more particularly to such methods as rely on theinter-engagement of dovetail members for such attachment, the chiefobject of the present invention being to provide an improved dovetailiitment whereby a telescope sight can be more readily and reliablyattached to rifles and like firearms while permitting of ready removaland replacement.

According to the present invention the telescope tube carries a singlemember provided with a parallel dovetail part adapted to enter intoengagement with a corresponding parallel dovetail part carried on thefirearm and to be securely held when so engaged by means of a fixed stopor plate provided, for instance, on the forward end of the firearmdovetail part, and a nose on a spring catch which automatically operatesat the position of abutment against said stop or plate to preventdisplacement away from the same.

In the preferred construction a female parallel dovetail member may beattached to the bolt casing of the rifle by screws or other suitablemeans, the dovetail being closed at its forward (muzzle) end to providea stop for a male parallel dovetail member carried by the telescopetube. A spring, which may be sunk in and along one face of the femaledovetail, carries a stop at the rear end which the male dovetaildepresses as it slides over it when the telescope is inserted intoposition and which is released and engages with the rear end of the maledovetail when the telescope is fully up to the front stop. A suitabledevice such as a second spring sunk in either dovetail may be providedto press the telescope attachment firmly against a face or faces ofthefemale dovetail, insuring that the telescope shall always occupy exactlythe same position during the process of taking aim.

In order that the said invention may be clearly understood and readilycarried into effect, I will describe the same more fully with referenceto the accompanying drawings, in which Figure l shows in elevation atelescope sight secured in place upon a rifle. Fig. 2 is a cross sectionon the line :z2- m of Fig. l, through the sight mounting and bolt casingof the rifle; and Figs. 8 and 4 show in elevation the two dovetailmembers.

A is the telescope tube, of which the outline only is indicated, as itforms no part of the present invention.

B is the rifle stock.

C is the bolt casing.

D is the female dovetail member fitted upon the bolt casing and E is themale dovetail member firmly secured on the tube A.

The female member D must be fitted upon the rifle with great accuracy,so that the telescope tube may lie parallel to the axis of the riflebarrel. For this 4purpose the side of the bolt casing may have twolongitudinal surfaces o, o carefully machined flat to receive twocorresponding surfaces on the back of the member D. rlhe face of thefront wall c2 of the bolt casing may also be machined at the sideagainst which the end plate d of the member D abuts to give a properabutment for the member, which is preferably secured at the lower liangeCZ only, by the screws Z2 entering the side of the bolt casing. Thesescrews pass through the bolt casing and the ends projecting into thebolt chamber are filed off accurately flush with and conforming to theradius of the inside face of said chamber.

Part of the male member E is formed as a slotted sleeve e which embracesand can be fixed to the telescope tube A immediately in front of thefixed collar a shrunk on the tube and serving to prevent any forwarddisplacement of. the telescope due to the recoil of the riie on firing.

The two dovetail members must fit with great accuracy and to prevent themale dovetail riding backward when it has been slid into position themember D is provided with a spring catch Z3 lying in a recess d* in thebottom of the dovetail, the end of the spring carrying a projecting stopwhich springs up behind the rear end of the member E when the latter hasbeen pushed in until its front end meets the end plate (Z closing thefront of the female dovetail.

To prevent any looseness one side of the male dovetail is recessed toreceive the spring c which lies along its face and presses against theinner face of the female dovetail, but this spring does not form theactual dovetail face7 which is constituted by the narrow solid face orledge e2 above the spring channel.

It is of great importance that the shock of firing shall not displacethe sight and the shock of recoil must therefore be transmitted to thetelescope tube in a manner which avoids any displacement. This iseffected in the present fitting by securing the member D so that itsfront plate cl abuts firmly against the front Wall 02 of the bolt casingC and by securing the male dovetail so that its front end abuts againstthe plate (Z. Also to take the shock as near as possible to the base ofthe dovetail the front end of the male dovetail may be slightly recessedas shown in Fig. l to leave a nose e3 at the base projecting to meet theplate d. rThe shock is therefore transmitted through the plate (Z, maledovetail meinbergsleeve e and collar a and at no point is there dangerof bending or distortion of the parts.

What I claim and desire to secure by Letters Patent of the United Statesis 1. A telescope sight attachment for firearms com'prising a singleparallel dovetail member on the telescope tube, a corresponding paralleldovetail member on the firearm, a fixed stop on the second memberdeterinining the position of the telescope member and means for securingthe latter member at the position of abutment against the said stop.

2. A telescope sight attachment for firearms comprising a singleparallel dovetail member on the telescope tube, a corresponding paralleldovetail member on the firearm, a fixed stop determining the position ofthe telescope and a spring catch having a nose which engages a dovetailmember at the position of abutment against the stop.

3. A telescope sight attachment for firearms comprising` Iasinglefmember on the telescope tube provided With a parallel maledovetail partha corresponding parallel female dovetail `--lmember on thefirearm, a plate closing the-forward end of the female dovetail andmeans for holding the male dovetail in position in abutment With thesaid plate.

4l. A telescope sight attachment for firearms comprising a singleparallel dovetail member on the telescope tube, a corresponding paralleldovetail member' on the firearm, a fixed stop determining the positionof the telescope, and a spring vcatch tted to a` face of the dovetailmember on the firearm and having a nose which engages the end of thetelescope dovetail member when the latter is in abutment against thestop.

5. A telescope sight attachment for firearms eomprising a singleparallel dovetail member on the telescope tube, a corresponding paralleldovetail member on the firearm, a fixed vstop determining the positionof the telescope and a spring catch fixed in a reeess in the base of thefemale. dovetail member and adapted to be depressed by the male dovetailmember on entry of the latter into the female dovetail and to bereleased automatically at the position of abutment against the stop soas to engage the male dovetail member.

6. ln a telescope sight attachment for rifles7 a dovetail member havinga flange at one side, a machined face formed on the bolt easing of therifle, on which faee the side flange of the said dovetail member isscrewed and a corresponding dovetail member on the telescope.

7. A telescope sight attachment for firearms comprising coperatingparallel male and female dovetail members on the telescope and firearm,a plate closing the end of the female dovetail and a progeeting nose onthe end of the male dovetail adapted to,

abut against the said plate.

8. A telescope sight attachment for firearms comprising coperatingparallel male and female dovetail members on the telescope and firearm,one of the dovetail faces being formed ivith a shallow recess leavingpart of the face at the side uncut, and a spring fitted in the saidrecess and adapted to bear against the face of the second dovetailmember while the dovetail fit is Y-made by the said uncut part of theface.

9. A telescope sight attachment for firearms comprising a singleparallel dovetail member on the telescope tube, a corresponding paralleldovetail member on the firearm, a fixed stop determining the position ofthe telescope. means for securing the latter at the position of abutmentagainst the said stop, a parallelk slotted sleeve on the first dovetailmember embracing and fixed to the telescope tube and a collar fixed onthe said tube as an abutment for the said sleeve.

ARTHUR BERNARD ROLFE-MARTIN.

Copies of this patent may be obtained for live cents each, by addressingthe Commissioner of Patents, Washington, D. C.

